Just a glimpse of the bright, true-blue flowers of perennial plumbago and it will be love at first sight. It's easy to see why the Georgia Plant Selections Committee chose this durable, gorgeous flowering groundcover as the 2006 Georgia Gold Medal winner for herbaceous perennials." /> Just a glimpse of the bright, true-blue flowers of perennial plumbago and it will be love at first sight. It's easy to see why the Georgia Plant Selections Committee chose this durable, gorgeous flowering groundcover as the 2006 Georgia Gold Medal winner for herbaceous perennials." />
Menu
Published on 02/16/06

Award-winning groundcover offers true-blue flowers

By Gary Wade
University of Georgia

Just a glimpse of the bright, true-blue flowers of perennial plumbago and it will be love at first sight. It's easy to see why the Georgia Plant Selections Committee chose this durable, gorgeous flowering groundcover as the 2006 Georgia Gold Medal winner for herbaceous perennials.

Volume XXXI
Number 1
Page 21

Perennial plumbago (Ceratostigma plumbaginoides) grows just 6 to 10 inches tall and spreads 1 to 2 feet wide. It's a great choice for filling spaces between shrubs, creeping over rocks in a rock garden, adding a splash of blue to the perennial border or spilling over walls.

Drought and deer tolerance and a long bloom period are other outstanding qualities of this award-winning plant.

Background

Perennial plumbago, also called leadwort, belongs to a group of deciduous perennials and shrubs from eastern Africa and Asia. It's a semiwoody, mat-forming perennial that spreads by rhizomes, or shallow underground stems. It thrives in hardiness zones 5 to 9.

The plant dies back to the ground each year. Then it leafs out late in the spring. So, plant it where it won't get damaged by early spring cultivation.

The late spring green-up makes perennial plumbago an excellent plant for interplanting with spring-flowering bulbs. Its leaves will be emerging just as the foliage of the bulbs is dying back.

When they emerge, the shiny green leaves are up to 2 inches long. They turn bronze-red in the fall.

True-blue

Perennial plumbago's medium-blue flowers resemble those of woodland phlox. They emerge in terminal clusters in late summer and continue to emerge until the fall frost. It's an exceptionally long bloom period. Each flower is one-half to three-quarters of an inch across and has five petals.

The plant prefers a sunny site. But it will tolerate some afternoon shade. Once you get it established, it's quite drought-tolerant. Plant it in the spring so you'll be sure to get it established before the summer bloom. The spring planting will enable it to become hardier next winter, too.

Fertilize perennial plumbago lightly in the spring and again in early summer, if you need to encourage more rapid cover. Wait until new leaves emerge to prune out any dead wood from the previous season.

Summer cuttings, spring division, root cuttings and seeds are all common methods used to propagate the plant. And you'll want more of this Georgia Gold Medal winner.

(Gary Wade is a Cooperative Extension horticulturist with the University of Georgia College of Agricultural and Environmental Sciences.)

Gary Wade is a Cooperative Extension horticulturist with the University of Georgia College of Agricultural and Environmental Sciences.